{"gene":"AXIN1","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2000,"finding":"AXIN1 encodes a scaffold protein that negatively regulates the Wnt pathway; adenovirus-mediated transfer of wild-type AXIN1 induced apoptosis in hepatocellular and colorectal cancer cells harboring APC, CTNNB1, or AXIN1 mutations, and AXIN1-mutant cells showed increased TCF/β-catenin nuclear DNA binding.","method":"Adenoviral gene transfer, TCF DNA-binding assay, sequencing of cancer cell lines and primary tumors","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct functional rescue experiment in multiple cancer cell lines, replicated across multiple labs subsequently","pmids":["10700176"],"is_preprint":false},{"year":2001,"finding":"A missense mutation in the GSK3-binding domain of zebrafish Axin1 (masterblind allele) abolishes binding of Axin1 to GSK3 and impairs TCF-dependent transcription, causing fate transformation of telencephalon and eyes to diencephalon; overexpression of wild-type Axin1 or GSK3β rescued the phenotype.","method":"Genetic mapping, binding assay (GSK3/Axin1 interaction), TCF reporter assay, rescue by overexpression in zebrafish","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis with mutagenesis of specific domain, functional rescue, consistent with mammalian mechanism","pmids":["11390362"],"is_preprint":false},{"year":2009,"finding":"Axin1 scaffold protein facilitates formation of a c-Myc degradation complex containing GSK3β, Pin1, and PP2A-B56α; Axin1 knockdown decreases c-Myc association with these proteins, reduces T58 phosphorylation, enhances S62 phosphorylation, and increases c-Myc stability, while acute Axin1 expression reduces c-Myc levels and suppresses c-Myc transcriptional activity.","method":"Co-immunoprecipitation, siRNA knockdown, overexpression, phosphorylation assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, knockdown and overexpression with multiple readouts, single lab but orthogonal methods","pmids":["19131971"],"is_preprint":false},{"year":2010,"finding":"The central region of Axin1 implicated in binding GSK3β and β-catenin is natively unfolded (intrinsically disordered), supporting a model in which the unfolded scaffold facilitates dynamic kinase-substrate interactions required for β-catenin phosphorylation.","method":"NMR, circular dichroism, analytical ultracentrifugation, and other biophysical methods","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biophysical methods (NMR, CD, AUC) establishing structural disorder, single lab","pmids":["21087614"],"is_preprint":false},{"year":2012,"finding":"Wnt signaling suppresses β-catenin ubiquitination within an intact Axin1 complex rather than causing complex disassembly or inhibiting phosphorylation of Axin1-bound β-catenin; β-catenin is phosphorylated, ubiquitinated, and degraded all within the intact Axin1 complex, and Wnt signaling leads to complex saturation by phospho-β-catenin, allowing newly synthesized free β-catenin to accumulate.","method":"Endogenous protein immunoprecipitation, mass spectrometry, proteasome inhibition, Wnt stimulation in colorectal cancer cells and primary intestinal epithelium","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (IP-MS, quantitative proteomics, functional assays), validated in primary tissue and cancer lines","pmids":["22682247"],"is_preprint":false},{"year":2012,"finding":"Conditional hepatocyte-specific deletion of Axin1 in adult mice leads to acute hepatocyte proliferation, activation of a subset of Wnt target genes (Axin2, c-Myc, cyclin D1), but does not increase nuclear β-catenin or cause zonation changes typical of APC loss; 5/9 mice developed HCC after one year.","method":"Conditional Cre/loxP knockout, qRT-PCR, immunoprecipitation, histology, immunoblot","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with defined cellular and transcriptional phenotype, multiple readouts in vivo","pmids":["22960659"],"is_preprint":false},{"year":2011,"finding":"Decreased AXIN1 expression and altered ratio of two naturally occurring AXIN1 splice variants in breast cancer contributes to increased c-Myc protein stability, altered S62/T58 phosphorylation balance, and increased oncogenic c-Myc activity.","method":"Splice variant quantification, siRNA knockdown, phosphorylation assays, primary breast cancer tissue analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (splice variant analysis, functional knockdown, phospho-readout), single lab","pmids":["21808024"],"is_preprint":false},{"year":2014,"finding":"Axin1 forms a physical complex with NRF2 (involving the central region of Axin1 and the Neh4/Neh5 domains of NRF2), and WNT-3A regulates this complex; Axin1 knockdown increases NRF2 protein levels; Axin1 stabilization with tankyrase inhibitors blocks WNT/NRF2 signaling; conditional hepatocyte-specific Axin1 deletion upregulates the NRF2 antioxidant signature.","method":"Co-immunoprecipitation, siRNA knockdown, conditional liver KO mice, tankyrase inhibitor treatment, reporter assays","journal":"Antioxidants & redox signaling","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, in vivo conditional KO, pharmacological validation, multiple orthogonal methods","pmids":["25336178"],"is_preprint":false},{"year":2017,"finding":"TRIM65 E3 ubiquitin ligase directly binds Axin1 and promotes its ubiquitination and proteasomal degradation, thereby activating β-catenin signaling in hepatocellular carcinoma.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression and knockdown with β-catenin readout, in vitro and in vivo","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding (Co-IP) plus ubiquitination assay plus functional rescue, single lab","pmids":["28754688"],"is_preprint":false},{"year":2020,"finding":"USP44 deubiquitinase interacts with Axin1 and reduces its ubiquitination, thereby stabilizing Axin1 protein (without affecting Axin1 mRNA), suppressing β-catenin signaling, inhibiting proliferation, and promoting apoptosis in colorectal cancer cells.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression and knockdown, Axin1 mRNA stability measurement","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding plus deubiquitination assay plus functional rescue, single lab","pmids":["32285989"],"is_preprint":false},{"year":2018,"finding":"TRIM11 E3 ubiquitin ligase directly interacts with Axin1 (Co-IP) and promotes its ubiquitination and degradation, thereby activating β-catenin signaling in lymphoma cells.","method":"Co-immunoprecipitation, ubiquitination detection, overexpression and knockdown","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP plus ubiquitination assay plus functional rescue, single lab","pmids":["31786079"],"is_preprint":false},{"year":2018,"finding":"RNF146 E3 ubiquitin ligase promotes ubiquitination of Axin1, leading to its degradation and activation of β-catenin signaling in colorectal cancer.","method":"Co-immunoprecipitation, ubiquitination assay, knockdown and overexpression","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and ubiquitination assay, single lab, limited mechanistic follow-up","pmids":["29932918"],"is_preprint":false},{"year":2011,"finding":"Hsp90α/β associates with a complex containing GSK3β, axin1, β-catenin, and phospho-β-catenin in MCF-7 breast cancer cells; Hsp90 inhibition modulates β-catenin phosphorylation within this complex.","method":"Co-immunoprecipitation, confocal laser scanning microscopy, selective Hsp90 inhibition","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP, single lab, limited mechanistic follow-up","pmids":["21925151"],"is_preprint":false},{"year":2010,"finding":"MAP3K1 physically interacts with Axin1 in an interaction induced and modulated by Wnt stimulation; MAP3K1 E3 ubiquitin ligase activity (not kinase activity) is required for TCF/LEF-driven transcription and Wnt3A-driven endogenous gene expression.","method":"Immunoprecipitation-coupled proteomics (IP-MS), siRNA depletion, ubiquitin ligase vs kinase mutant analysis, TCF reporter assay","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS followed by functional validation with mutant analysis, two orthogonal methods, single lab","pmids":["20128690"],"is_preprint":false},{"year":2016,"finding":"γ-Protocadherin-C3 physically interacts with the DIX domain of Axin1 via its unique variable cytoplasmic domain; C3-VCD competes with Dishevelled for DIX domain binding, stabilizes Axin1 at the membrane, and reduces Lrp6 phosphorylation to inhibit Wnt signaling.","method":"Co-immunoprecipitation, competitive binding assay, Lrp6 phosphorylation assay, conditional transgenic in vivo","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding plus competition assay plus in vivo validation, single lab, multiple orthogonal methods","pmids":["27530555"],"is_preprint":false},{"year":2023,"finding":"γ-Pcdh-C3 interacts with Axin1 in the cortex in vivo; loss of γC3 disrupts Axin1 localization to synaptic fractions and severely reduces dendritic complexity of cortical pyramidal neurons; rescue experiments in cultured neurons show γC3 promotes arborization through an Axin1-dependent mechanism mediated by the C3 variable cytoplasmic domain.","method":"In vivo co-IP from cortex, subcellular fractionation, CRISPR/Cas9 KO, rescue with domain deletion constructs, confocal imaging of dendrites","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo binding confirmed, subcellular fractionation, KO phenotype with mechanistic domain rescue, multiple orthogonal methods","pmids":["36604170"],"is_preprint":false},{"year":2012,"finding":"Axin1 (but not Axin2) plays an essential role in host defense against Salmonella; pathogenic Salmonella reduces Axin1 levels post-translationally through ubiquitination and SUMOylation involving the DIX domain and Ser614 of Axin1; loss of Axin1 increases bacterial invasiveness and inflammatory response in intestinal epithelial cells.","method":"Immunofluorescence, Western blotting, domain mapping (DIX domain and Ser614 mutants), ubiquitination/SUMOylation assays, siRNA knockdown","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with specific mutations, multiple PTM assays, functional readout, single lab","pmids":["22509369"],"is_preprint":false},{"year":2016,"finding":"RUNX1 and estrogen receptor (ER) occupy adjacent regulatory elements in AXIN1's second intron; RUNX1 antagonizes estrogen/ER-mediated suppression of AXIN1 transcription; RUNX1 loss in ER+ mammary epithelial cells decreases AXIN1, increases β-catenin, deregulates mitosis, and stimulates proliferation; these effects are rescued by AXIN1 stabilization.","method":"ChIP, siRNA knockdown in vitro and conditional KO in vivo, RNA-seq, rescue experiments with AXIN1 stabilization","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP identifying binding sites, in vivo KO, in vitro rescue, RNA-seq, multiple orthogonal methods","pmids":["26916619"],"is_preprint":false},{"year":2016,"finding":"Vitamin D receptor (VDR) transcriptionally regulates Axin1 expression via a genomic VDR binding site in the Axin1 regulatory region; VDR deletion reduces cytosolic Axin1 protein and mRNA; VDR and Axin1 do not physically interact.","method":"ChIP assay, conditional intestinal VDR KO mice, Western blot, RT-PCR, subcellular fractionation, cycloheximide/actinomycin chase, immunohistochemistry","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP identifies binding site, in vivo KO confirms, subcellular fractionation, single lab with multiple methods","pmids":["27601169"],"is_preprint":false},{"year":2015,"finding":"Axin1 knockdown in satellite cells (skeletal muscle stem cells) suppresses proliferation and promotes premature myogenic differentiation; simultaneous knockdown of Axin1 and β-catenin rescues proliferation and partially prevents premature differentiation, placing Axin1 function upstream of β-catenin in muscle stem cell regulation; Axin1 and Axin2 are not fully redundant in satellite cells.","method":"siRNA knockdown, retroviral overexpression, Axin2-null mouse satellite cells, TCF reporter assay, immunofluorescence for nuclear β-catenin","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (double knockdown rescue), reporter assay, null mouse cells, single lab","pmids":["25866367"],"is_preprint":false},{"year":2016,"finding":"Axin-1 localizes around the meiotic spindle in mouse oocytes; Axin1 siRNA knockdown causes defective spindles, misaligned chromosomes, failure of first polar body extrusion, impaired pronuclear formation, and loss of γ-tubulin/Nek9 at spindle poles with retention of BubR1 at kinetochores.","method":"Immunofluorescence localization, siRNA microinjection into oocytes, spindle assembly checkpoint analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional siRNA knockdown and specific phenotypic readouts, single lab","pmids":["27284927"],"is_preprint":false},{"year":2017,"finding":"In tankyrase inhibitor-treated colorectal cancer cells, AXIN1 is not required for degradasome (β-catenin destruction complex assembly) formation, whereas AXIN2 depletion substantially impairs both degradasome formation and its capacity to degrade β-catenin.","method":"siRNA depletion, tankyrase inhibitor (G007-LK) treatment, fluorescence microscopy of degradasomes, β-catenin degradation assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean siRNA depletion of AXIN1 vs AXIN2 with functional readout, single lab, orthogonal imaging and biochemical methods","pmids":["28107521"],"is_preprint":false},{"year":2018,"finding":"Peptide microarray mapping of the AXIN1 intrinsically disordered region identified multiple binding epitopes for CK1ε, c-Myc, Pin1, and p53; AXIN1 competes with Dishevelled (DVL) for CK1ε binding and regulates CK1ε-induced DVL phosphorylation and Wnt/β-catenin activation, validated with epitope-mimicking peptides and short deletion variants.","method":"Peptide microarray, in vitro binding assay, epitope-mimicking peptide competition, AXIN1 deletion variants, phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro peptide microarray with functional validation using competitive peptides and deletion mutants, single lab","pmids":["30166345"],"is_preprint":false},{"year":2018,"finding":"C9orf140, identified by tandem-affinity purification and mass spectrometry as an Axin1-interacting protein, negatively regulates Wnt/β-catenin signaling by outcompeting PP2A for Axin1 binding, thereby shifting the balance toward β-catenin phosphorylation and preventing Wnt3A-induced β-catenin accumulation; Wnt-induced C9orf140 expression via β-catenin creates a negative feedback loop.","method":"TAP-MS, Co-immunoprecipitation, competitive binding assay, zebrafish validation, reporter assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TAP-MS discovery, reciprocal Co-IP, competitive binding, in vivo zebrafish validation, single lab","pmids":["29531269"],"is_preprint":false},{"year":2019,"finding":"AXIN1 deletion cooperates with c-Met activation to induce hepatocellular carcinoma in mice in a β-catenin-dependent but Notch-independent manner; genetic deletion of β-catenin completely prevented HCC development in c-Met/sgAxin1 mice, whereas blocking Notch via dominant-negative RBP-J or Notch2 ablation had no effect.","method":"CRISPR/Cas9 gene deletion in vivo, hydrodynamic transposition, conditional Ctnnb1 KO, dominant-negative RBP-J, Notch2 KO, gene expression analysis","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo epistasis with genetic KO of downstream effectors, multiple genetic perturbations, rigorous controls","pmids":["30737831"],"is_preprint":false},{"year":2022,"finding":"AXIN1 binds to YAP/TAZ in human HCC cells and regulates YAP/TAZ stability; deletion of Axin1 strongly induces nuclear YAP/TAZ; concomitant Yap and Taz deletion significantly inhibits c-Met/sgAxin1-driven HCC, identifying YAP/TAZ as major downstream effectors of AXIN1 loss-driven hepatocarcinogenesis.","method":"Co-immunoprecipitation, conditional YAP/TAZ KO in vivo, inducible CreERT2 system, tumor growth assays, tankyrase inhibitor combination treatment","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding by Co-IP plus in vivo epistasis with conditional KO, single lab","pmids":["35921500"],"is_preprint":false},{"year":2022,"finding":"SIRT4 translocates from mitochondria to the cytoplasm upon Wnt stimulation and deacetylates Axin1 at K147 (within the RGS domain); K147 acetylation in resting cells maintains the destruction complex; the Axin1-K147R mutant impairs β-TrCP assembly into the destruction complex, leading to β-catenin accumulation even without Wnt stimulation.","method":"Acetylation assay, SIRT4 overexpression and KD, site-directed mutagenesis (K147R), subcellular fractionation, Co-IP","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis with functional readout and deacetylase identification, single lab","pmids":["35707358"],"is_preprint":false},{"year":2024,"finding":"Hypoxia induces lactylation of Axin1 protein at K147, which promotes its ubiquitination and proteasomal degradation, thereby relieving Axin1-mediated suppression of glycolysis and cell stemness in esophageal carcinoma cells; Axin1-K147 mutant resistant to lactylation reverses these effects.","method":"Pan-lysine lactylation mass spectrometry, site-directed mutagenesis (K147), ubiquitination assay, ECAR/glucose/lactate measurements, in vivo tumor growth","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis, PTM assay, functional metabolic readout, in vivo validation, single lab","pmids":["38972426"],"is_preprint":false},{"year":2024,"finding":"AXIN1 stabilizes the antiviral transcription factor IRF3 by recruiting USP35, which removes K48-linked ubiquitination at IRF3 K366, preventing p62-mediated autophagic degradation; upon virus infection, TBK1-phosphorylated AXIN1 undergoes phase separation, increasing IRF3 phosphorylation and IFN-I production; KYA1797K (binding AXIN1 RGS domain) enhances AXIN1-IRF3 interaction.","method":"Co-immunoprecipitation, ubiquitination assay (K48-linkage specific), autophagic flux assay, phase separation imaging, TBK1 phosphorylation assay, pharmacological RGS-domain ligand","journal":"Signal transduction and targeted therapy","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal biochemical methods (Co-IP, ubiquitination linkage specificity, phase separation, phosphorylation), mechanistic mutagenesis, pharmacological validation, single lab","pmids":["39384753"],"is_preprint":false},{"year":2024,"finding":"Analysis of 80 tumor-associated AXIN1 missense variants identified 18 that significantly activate β-catenin signaling; most loss-of-function missense mutations lose binding to the interaction partner corresponding to the mutated domain (GSK3β, β-catenin, or RGS/APC binding domains); truncated AXIN1 proteins inversely correlate with β-catenin regulatory function.","method":"Co-immunoprecipitation for each domain-specific binding partner, β-catenin reporter assay, structural prediction analysis for 80 variants","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — systematic functional analysis of 80 variants with Co-IP and reporter assay, structural validation, comprehensive domain mapping","pmids":["38359148"],"is_preprint":false},{"year":2019,"finding":"AXIN1 forms a complex with AMPK and LKB1 in skeletal muscle during contraction; contraction and AMPK activation upregulate total Axin1 protein; Axin1 knockdown reduces AMPK activation, GTP-loading of Rac1, PAK phosphorylation, and contraction-stimulated glucose uptake in C2C12 myotubes, defining an AMPK/Axin1-Rac1 signaling axis.","method":"Reciprocal co-immunoprecipitation from myotubes and mouse muscle, siRNA knockdown, AMPK activator treatment, glucose uptake assay, GTP-Rac1 pull-down","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP in vitro and in vivo, functional knockdown with specific pathway readouts, single lab","pmids":["31846370"],"is_preprint":false},{"year":2021,"finding":"In skeletal muscle-specific AXIN1 knockout mice, AXIN1 deletion does not affect AMPK/mTORC1 signaling or glucose uptake at rest or during contraction/exercise under most conditions, with the only difference being elevated α2/β2/γ3 AMPK activity and AMP/ATP ratio in gastrocnemius during exercise (likely due to AXIN2 functional redundancy).","method":"Tamoxifen-inducible muscle-specific KO, AMPK/mTORC1 phosphorylation assays, glucose uptake assay, exercise protocols, AMP/ATP measurement","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with comprehensive phenotypic characterization; negative result is itself mechanistically informative (redundancy with AXIN2)","pmids":["33913171"],"is_preprint":false},{"year":2022,"finding":"UCHL5 deubiquitinase physically interacts with multiple domains of Axin1 and is required for both stabilization and polymerization of Axin1 proteins; these events are governed by deubiquitination in the DIX domain of Axin1 but do not require the catalytic deubiquitinating activity of UCHL5.","method":"Co-immunoprecipitation, Axin1 domain-binding assays, Axin1 polymerization assay, catalytic UCHL5 mutant analysis, β-catenin reporter assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-binding Co-IP, polymerization assay, catalytic mutant analysis, single lab","pmids":["35256667"],"is_preprint":false},{"year":2022,"finding":"Axin1 is required for IFN-γ/Th1-mediated intestinal immune program; intestinal epithelial Axin1 deficiency renders mice more susceptible to chemically induced colon carcinogenesis but reduces DSS-induced colitis; Axin1 has redundant function with Axin2 for Wnt pathway down-regulation in the intestine.","method":"Intestinal epithelial-specific Axin1 KO, Axin2 KO, chemically induced tumorigenesis, DSS colitis, RNA-seq","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo conditional KO with multiple disease models and transcriptomic analysis, single lab","pmids":["36356835"],"is_preprint":false},{"year":2022,"finding":"Axin-1 C-terminal region (710-797 aa) binds the N-terminal region (1-100 aa) of Caveolin-1; disruption of this interaction by CRISPR/Cas9 increases TNF-α and IL-6 production and reduces β-catenin in alveolar type I cells challenged with LPS; Axin-1 functions as an adaptor for Caveolin-1 in regulating inflammatory cytokine production.","method":"Yeast two-hybrid screening, co-immunoprecipitation with domain mapping, CRISPR/Cas9 disruption, cytokine ELISA","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus Co-IP with domain mapping plus CRISPR functional disruption, single lab","pmids":["30954225"],"is_preprint":false},{"year":2020,"finding":"YTHDF2 RNA m6A reader promotes AXIN1 mRNA decay, thereby activating Wnt/β-catenin signaling in lung adenocarcinoma; knockout of AXIN1 rescues the inhibitory effect of YTHDF2 depletion on lung cancer cell proliferation, colony-formation, and migration.","method":"RNA-seq, m6A-seq, CLIP-seq, RIP-seq, mRNA stability assay, AXIN1 KO rescue experiment","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — integrative multi-omics plus epistatic rescue experiment, single lab, multiple orthogonal methods","pmids":["33980824"],"is_preprint":false},{"year":2022,"finding":"Deletion of Axin1 in condylar chondrocytes at adult stage causes OA-like degeneration associated with activation of both β-catenin and FGF/ERK1/2 signaling; increased Fgfr1 expression, MMP13 and Adamts5, and decreased lubricin were detected; both pathways cooperatively contribute to cartilage degeneration.","method":"Conditional tamoxifen-inducible chondrocyte KO, immunostaining, qRT-PCR, histomorphometry","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional KO in vivo with multiple pathway readouts, single lab","pmids":["30070692"],"is_preprint":false},{"year":2022,"finding":"Specific deletion of Axin1 in limb mesenchymal cells activates both β-catenin and BMP signaling, leading to fibular hemimelia-like phenotype; inhibition of either β-catenin or BMP signaling significantly reverses the FH phenotype, demonstrating that Axin1 controls limb development through integration of both pathways.","method":"Conditional limb mesenchyme Axin1 KO, pharmacological β-catenin and BMP inhibition, in vivo rescue","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean in vivo conditional KO with pharmacological epistasis experiments showing both pathways required, multiple rescue experiments","pmids":["36541713"],"is_preprint":false}],"current_model":"AXIN1 is a multifunctional scaffold protein that serves as the concentration-limiting component of the β-catenin destruction complex (together with APC, GSK3β, and CK1), where its natively disordered central region coordinates β-catenin phosphorylation, ubiquitination, and proteasomal degradation within an intact complex; upon Wnt signaling, β-catenin ubiquitination within the complex is suppressed without complex disassembly, leading to complex saturation and accumulation of free, transcriptionally active β-catenin. Beyond Wnt, AXIN1 scaffolds a c-Myc degradation complex (with GSK3β, Pin1, and PP2A-B56α), forms a regulatory complex with NRF2 to control antioxidant metabolism, interacts with YAP/TAZ to regulate Hippo signaling, stabilizes IRF3 against autophagic degradation and undergoes phase separation to boost antiviral IFN-I production, and is subject to multiple post-translational modifications including ubiquitination by E3 ligases (TRIM65, TRIM11, RNF146, UBE3C, TRIM54, TRIM32, TRIM46), deubiquitination by USP44 and UCHL5, deacetylation of K147 by SIRT4, and lactylation at K147 under hypoxia, all converging on control of AXIN1 protein stability and thus Wnt pathway activity."},"narrative":{"mechanistic_narrative":"AXIN1 is a multifunctional scaffold that acts as a negative regulator of Wnt/β-catenin signaling, with restoration of wild-type AXIN1 inducing apoptosis in cancer cells bearing APC, CTNNB1, or AXIN1 mutations and suppressing TCF/β-catenin transcription [PMID:10700176, PMID:11390362]. Its central region is intrinsically disordered, enabling the dynamic kinase–substrate contacts that bring GSK3β and β-catenin together for phosphorylation [PMID:21087614], and peptide-level mapping defines discrete binding epitopes within this region for partners including CK1ε, c-Myc, Pin1, and p53 [PMID:30166345]. Within an intact AXIN1-organized destruction complex, β-catenin is phosphorylated, ubiquitinated, and degraded; Wnt signaling does not disassemble this complex but suppresses β-catenin ubiquitination, saturating the complex with phospho-β-catenin so that newly synthesized free β-catenin accumulates [PMID:22682247]. Systematic analysis of tumor-associated missense variants shows that loss-of-function mutations selectively abolish binding to the partner corresponding to the mutated domain (GSK3β, β-catenin, or RGS/APC), and that truncated AXIN1 loses β-catenin regulatory function [PMID:38359148]. Beyond β-catenin, AXIN1 scaffolds a c-Myc degradation complex with GSK3β, Pin1, and PP2A-B56α, controlling the T58/S62 phosphorylation balance that governs c-Myc stability [PMID:19131971, PMID:21808024], and it physically engages NRF2 to restrain an antioxidant gene program [PMID:25336178] and YAP/TAZ to limit their nuclear accumulation [PMID:35921500]. In vivo, hepatocyte- or mesenchyme-specific Axin1 loss drives proliferation and tumorigenesis through β-catenin and cooperating YAP/TAZ, FGF/ERK, or BMP signaling [PMID:22960659, PMID:30737831, PMID:35921500, PMID:36541713], establishing AXIN1 as a tumor suppressor whose dosage is tightly controlled by E3 ligases (TRIM65, TRIM11) and deubiquitinases (USP44, UCHL5) acting on its stability and polymerization [PMID:28754688, PMID:32285989, PMID:35256667], by transcriptional inputs from RUNX1 and VDR [PMID:26916619, PMID:27601169], and by m6A-directed mRNA decay via YTHDF2 [PMID:33980824]. AXIN1 also operates outside growth control: it stabilizes the antiviral factor IRF3 via USP35-mediated deubiquitination and undergoes TBK1-driven phase separation to boost type I interferon production [PMID:39384753], scaffolds AMPK/LKB1 signaling in contracting muscle [PMID:31846370], and links γ-protocadherin-C3 to dendritic arborization in cortical neurons [PMID:36604170].","teleology":[{"year":2000,"claim":"Established AXIN1 as a tumor-suppressing negative regulator of Wnt signaling whose restoration kills cancer cells with destruction-complex mutations.","evidence":"Adenoviral AXIN1 transfer and TCF DNA-binding assays in hepatocellular and colorectal cancer lines","pmids":["10700176"],"confidence":"High","gaps":["Did not resolve the molecular architecture of the complex","Mechanism of apoptosis induction not defined"]},{"year":2001,"claim":"Localized AXIN1's Wnt-suppressing function to its GSK3-binding domain and confirmed the role in vivo through a developmental patterning phenotype.","evidence":"Zebrafish masterblind allele mapping, GSK3/Axin1 binding assay, and rescue by overexpression","pmids":["11390362"],"confidence":"High","gaps":["Did not address mammalian destruction-complex stoichiometry","Other domain functions untested"]},{"year":2009,"claim":"Extended AXIN1 scaffolding beyond β-catenin to c-Myc, showing it assembles a c-Myc degradation complex controlling T58/S62 phosphorylation.","evidence":"Reciprocal Co-IP, siRNA knockdown, and phosphorylation assays with GSK3β, Pin1, PP2A-B56α","pmids":["19131971"],"confidence":"High","gaps":["Single-lab finding","Quantitative contribution to c-Myc turnover in vivo unclear"]},{"year":2010,"claim":"Provided the biophysical basis for AXIN1 scaffolding by showing its central region is intrinsically disordered, enabling dynamic kinase-substrate engagement.","evidence":"NMR, circular dichroism, and analytical ultracentrifugation of the central region","pmids":["21087614"],"confidence":"High","gaps":["Structure of the assembled complex not resolved","Disorder-to-binding transitions not mapped at residue level"]},{"year":2012,"claim":"Redefined the Wnt mechanism by showing the destruction complex stays intact and that Wnt suppresses β-catenin ubiquitination, leading to complex saturation rather than disassembly.","evidence":"Endogenous IP-MS, proteasome inhibition, and Wnt stimulation in colorectal cells and primary intestinal epithelium","pmids":["22682247"],"confidence":"High","gaps":["Molecular trigger of ubiquitination suppression not fully defined","Role of AXIN1 vs AXIN2 not distinguished here"]},{"year":2014,"claim":"Connected AXIN1 to redox homeostasis by demonstrating a physical complex with NRF2 that restrains the antioxidant program.","evidence":"Reciprocal Co-IP with domain mapping, tankyrase inhibitors, and conditional liver KO mice","pmids":["25336178"],"confidence":"High","gaps":["Whether NRF2 regulation is destruction-complex dependent unclear","Direct fate of NRF2 within the complex not defined"]},{"year":2018,"claim":"Mapped discrete binding epitopes across the AXIN1 disordered region and showed competition with Dishevelled for CK1ε.","evidence":"Peptide microarray, in vitro binding, and competitive peptide/deletion variant assays","pmids":["30166345"],"confidence":"Medium","gaps":["In vitro mapping not all validated in cells","Functional hierarchy among epitopes unresolved"]},{"year":2024,"claim":"Systematically defined how tumor mutations inactivate AXIN1 by abolishing domain-specific partner binding, linking genotype to β-catenin activation.","evidence":"Co-IP for each domain partner and β-catenin reporter assays across 80 missense variants","pmids":["38359148"],"confidence":"High","gaps":["Variant effects on non-Wnt functions not tested","In vivo pathogenicity of individual variants not established"]},{"year":2024,"claim":"Revealed an AXIN1 role in innate antiviral immunity through IRF3 stabilization and TBK1-driven phase separation.","evidence":"Co-IP, K48-linkage-specific ubiquitination, autophagic flux, phase separation imaging, and RGS-ligand pharmacology","pmids":["39384753"],"confidence":"High","gaps":["Physiological relevance to host antiviral defense in vivo limited","Interplay with Wnt scaffolding function unclear"]},{"year":2022,"claim":"Demonstrated AXIN1 stability is governed by deubiquitinases controlling both protein level and polymerization independently of catalytic activity.","evidence":"Domain-binding Co-IP, polymerization assays, and catalytic UCHL5 mutant analysis","pmids":["35256667"],"confidence":"Medium","gaps":["Non-catalytic mechanism mechanistically undefined","USP44/UCHL5 redundancy not addressed"]},{"year":null,"claim":"How AXIN1's many roles (Wnt, c-Myc, NRF2, YAP/TAZ, IRF3, AMPK, neuronal arborization) are partitioned in a single cell and integrated with AXIN2 redundancy remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model 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ubiquitylation of AXIN1 to promote inflammatory factor-induced apoptosis of rat nucleus pulposus cells.","date":"2020","source":"American journal of physiology. Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/31967859","citation_count":14,"is_preprint":false},{"pmid":"31514071","id":"PMC_31514071","title":"MicroRNA-1181 supports the growth of hepatocellular carcinoma by repressing AXIN1.","date":"2019","source":"Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie","url":"https://pubmed.ncbi.nlm.nih.gov/31514071","citation_count":14,"is_preprint":false},{"pmid":"38715121","id":"PMC_38715121","title":"UBE2N promotes cell viability and glycolysis by promoting Axin1 ubiquitination in prostate cancer cells.","date":"2024","source":"Biology direct","url":"https://pubmed.ncbi.nlm.nih.gov/38715121","citation_count":13,"is_preprint":false},{"pmid":"33913171","id":"PMC_33913171","title":"AXIN1 knockout does not alter AMPK/mTORC1 regulation and glucose metabolism in mouse skeletal muscle.","date":"2021","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/33913171","citation_count":13,"is_preprint":false},{"pmid":"30166345","id":"PMC_30166345","title":"Analysis of binding interfaces of the human scaffold protein AXIN1 by peptide microarrays.","date":"2018","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30166345","citation_count":13,"is_preprint":false},{"pmid":"37973999","id":"PMC_37973999","title":"Tripartite motif 31 drives gastric cancer cell proliferation and invasion through activating the Wnt/β-catenin pathway by regulating Axin1 protein stability.","date":"2023","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/37973999","citation_count":13,"is_preprint":false},{"pmid":"35670901","id":"PMC_35670901","title":"TRIM46 upregulates Wnt/β-catenin signaling by inhibiting Axin1 to mediate hypoxia-induced epithelial-mesenchymal transition in HK2 cells.","date":"2022","source":"Molecular and cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/35670901","citation_count":13,"is_preprint":false},{"pmid":"10944858","id":"PMC_10944858","title":"Identification of novel polymorphisms in the AXIN1++ and CDX-2 genes.","date":"2000","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10944858","citation_count":13,"is_preprint":false},{"pmid":"28693262","id":"PMC_28693262","title":"AXIN1 protects against testicular germ cell tumors via the PI3K/AKT/mTOR signaling pathway.","date":"2017","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/28693262","citation_count":12,"is_preprint":false},{"pmid":"32269738","id":"PMC_32269738","title":"Axin1 inhibits proliferation, invasion, migration and EMT of hepatocellular carcinoma by targeting miR-650.","date":"2020","source":"American journal of translational 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oncology","url":"https://pubmed.ncbi.nlm.nih.gov/37379772","citation_count":12,"is_preprint":false},{"pmid":"30954225","id":"PMC_30954225","title":"Axin-1 binds to Caveolin-1 to regulate the LPS-induced inflammatory response in AT-I cells.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/30954225","citation_count":12,"is_preprint":false},{"pmid":"31398705","id":"PMC_31398705","title":"Stimulation of endothelial progenitor cells by microRNA-31a-5p to induce endothelialization in an aneurysm neck after coil embolization by modulating the Axin1-mediated β-catenin/vascular endothelial growth factor pathway.","date":"2019","source":"Journal of neurosurgery","url":"https://pubmed.ncbi.nlm.nih.gov/31398705","citation_count":12,"is_preprint":false},{"pmid":"36308071","id":"PMC_36308071","title":"Axin1: A novel scaffold protein joins the antiviral network of interferon.","date":"2022","source":"Molecular 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mice.","date":"2022","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/36541713","citation_count":11,"is_preprint":false},{"pmid":"15981102","id":"PMC_15981102","title":"Infrequent mutation of APC, AXIN1, and GSK3B in human pituitary adenomas with abnormal accumulation of CTNNB1.","date":"2005","source":"Journal of neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/15981102","citation_count":11,"is_preprint":false},{"pmid":"33506901","id":"PMC_33506901","title":"LncDBH-AS1 knockdown enhances proliferation of non-small cell lung cancer cells by activating the Wnt signaling pathway via the miR-155/AXIN1 axis.","date":"2021","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33506901","citation_count":10,"is_preprint":false},{"pmid":"32695658","id":"PMC_32695658","title":"Long-Term Inhibition of Notch in A-375 Melanoma Cells Enhances Tumor Growth Through the Enhancement of AXIN1, CSNK2A3, and CEBPA2 as Intermediate Genes in Wnt and Notch Pathways.","date":"2020","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/32695658","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52687,"output_tokens":9322,"usd":0.148946,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":19627,"output_tokens":3732,"usd":0.095717,"stage2_stop_reason":"end_turn"},"total_usd":0.244663,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"AXIN1 encodes a scaffold protein that negatively regulates the Wnt pathway; adenovirus-mediated transfer of wild-type AXIN1 induced apoptosis in hepatocellular and colorectal cancer cells harboring APC, CTNNB1, or AXIN1 mutations, and AXIN1-mutant cells showed increased TCF/β-catenin nuclear DNA binding.\",\n      \"method\": \"Adenoviral gene transfer, TCF DNA-binding assay, sequencing of cancer cell lines and primary tumors\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct functional rescue experiment in multiple cancer cell lines, replicated across multiple labs subsequently\",\n      \"pmids\": [\"10700176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"A missense mutation in the GSK3-binding domain of zebrafish Axin1 (masterblind allele) abolishes binding of Axin1 to GSK3 and impairs TCF-dependent transcription, causing fate transformation of telencephalon and eyes to diencephalon; overexpression of wild-type Axin1 or GSK3β rescued the phenotype.\",\n      \"method\": \"Genetic mapping, binding assay (GSK3/Axin1 interaction), TCF reporter assay, rescue by overexpression in zebrafish\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis with mutagenesis of specific domain, functional rescue, consistent with mammalian mechanism\",\n      \"pmids\": [\"11390362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Axin1 scaffold protein facilitates formation of a c-Myc degradation complex containing GSK3β, Pin1, and PP2A-B56α; Axin1 knockdown decreases c-Myc association with these proteins, reduces T58 phosphorylation, enhances S62 phosphorylation, and increases c-Myc stability, while acute Axin1 expression reduces c-Myc levels and suppresses c-Myc transcriptional activity.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, overexpression, phosphorylation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, knockdown and overexpression with multiple readouts, single lab but orthogonal methods\",\n      \"pmids\": [\"19131971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The central region of Axin1 implicated in binding GSK3β and β-catenin is natively unfolded (intrinsically disordered), supporting a model in which the unfolded scaffold facilitates dynamic kinase-substrate interactions required for β-catenin phosphorylation.\",\n      \"method\": \"NMR, circular dichroism, analytical ultracentrifugation, and other biophysical methods\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biophysical methods (NMR, CD, AUC) establishing structural disorder, single lab\",\n      \"pmids\": [\"21087614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Wnt signaling suppresses β-catenin ubiquitination within an intact Axin1 complex rather than causing complex disassembly or inhibiting phosphorylation of Axin1-bound β-catenin; β-catenin is phosphorylated, ubiquitinated, and degraded all within the intact Axin1 complex, and Wnt signaling leads to complex saturation by phospho-β-catenin, allowing newly synthesized free β-catenin to accumulate.\",\n      \"method\": \"Endogenous protein immunoprecipitation, mass spectrometry, proteasome inhibition, Wnt stimulation in colorectal cancer cells and primary intestinal epithelium\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (IP-MS, quantitative proteomics, functional assays), validated in primary tissue and cancer lines\",\n      \"pmids\": [\"22682247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Conditional hepatocyte-specific deletion of Axin1 in adult mice leads to acute hepatocyte proliferation, activation of a subset of Wnt target genes (Axin2, c-Myc, cyclin D1), but does not increase nuclear β-catenin or cause zonation changes typical of APC loss; 5/9 mice developed HCC after one year.\",\n      \"method\": \"Conditional Cre/loxP knockout, qRT-PCR, immunoprecipitation, histology, immunoblot\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with defined cellular and transcriptional phenotype, multiple readouts in vivo\",\n      \"pmids\": [\"22960659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Decreased AXIN1 expression and altered ratio of two naturally occurring AXIN1 splice variants in breast cancer contributes to increased c-Myc protein stability, altered S62/T58 phosphorylation balance, and increased oncogenic c-Myc activity.\",\n      \"method\": \"Splice variant quantification, siRNA knockdown, phosphorylation assays, primary breast cancer tissue analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (splice variant analysis, functional knockdown, phospho-readout), single lab\",\n      \"pmids\": [\"21808024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Axin1 forms a physical complex with NRF2 (involving the central region of Axin1 and the Neh4/Neh5 domains of NRF2), and WNT-3A regulates this complex; Axin1 knockdown increases NRF2 protein levels; Axin1 stabilization with tankyrase inhibitors blocks WNT/NRF2 signaling; conditional hepatocyte-specific Axin1 deletion upregulates the NRF2 antioxidant signature.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, conditional liver KO mice, tankyrase inhibitor treatment, reporter assays\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, in vivo conditional KO, pharmacological validation, multiple orthogonal methods\",\n      \"pmids\": [\"25336178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM65 E3 ubiquitin ligase directly binds Axin1 and promotes its ubiquitination and proteasomal degradation, thereby activating β-catenin signaling in hepatocellular carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression and knockdown with β-catenin readout, in vitro and in vivo\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding (Co-IP) plus ubiquitination assay plus functional rescue, single lab\",\n      \"pmids\": [\"28754688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP44 deubiquitinase interacts with Axin1 and reduces its ubiquitination, thereby stabilizing Axin1 protein (without affecting Axin1 mRNA), suppressing β-catenin signaling, inhibiting proliferation, and promoting apoptosis in colorectal cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression and knockdown, Axin1 mRNA stability measurement\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding plus deubiquitination assay plus functional rescue, single lab\",\n      \"pmids\": [\"32285989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM11 E3 ubiquitin ligase directly interacts with Axin1 (Co-IP) and promotes its ubiquitination and degradation, thereby activating β-catenin signaling in lymphoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination detection, overexpression and knockdown\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP plus ubiquitination assay plus functional rescue, single lab\",\n      \"pmids\": [\"31786079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RNF146 E3 ubiquitin ligase promotes ubiquitination of Axin1, leading to its degradation and activation of β-catenin signaling in colorectal cancer.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, knockdown and overexpression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and ubiquitination assay, single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"29932918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Hsp90α/β associates with a complex containing GSK3β, axin1, β-catenin, and phospho-β-catenin in MCF-7 breast cancer cells; Hsp90 inhibition modulates β-catenin phosphorylation within this complex.\",\n      \"method\": \"Co-immunoprecipitation, confocal laser scanning microscopy, selective Hsp90 inhibition\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP, single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"21925151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MAP3K1 physically interacts with Axin1 in an interaction induced and modulated by Wnt stimulation; MAP3K1 E3 ubiquitin ligase activity (not kinase activity) is required for TCF/LEF-driven transcription and Wnt3A-driven endogenous gene expression.\",\n      \"method\": \"Immunoprecipitation-coupled proteomics (IP-MS), siRNA depletion, ubiquitin ligase vs kinase mutant analysis, TCF reporter assay\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS followed by functional validation with mutant analysis, two orthogonal methods, single lab\",\n      \"pmids\": [\"20128690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"γ-Protocadherin-C3 physically interacts with the DIX domain of Axin1 via its unique variable cytoplasmic domain; C3-VCD competes with Dishevelled for DIX domain binding, stabilizes Axin1 at the membrane, and reduces Lrp6 phosphorylation to inhibit Wnt signaling.\",\n      \"method\": \"Co-immunoprecipitation, competitive binding assay, Lrp6 phosphorylation assay, conditional transgenic in vivo\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding plus competition assay plus in vivo validation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27530555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"γ-Pcdh-C3 interacts with Axin1 in the cortex in vivo; loss of γC3 disrupts Axin1 localization to synaptic fractions and severely reduces dendritic complexity of cortical pyramidal neurons; rescue experiments in cultured neurons show γC3 promotes arborization through an Axin1-dependent mechanism mediated by the C3 variable cytoplasmic domain.\",\n      \"method\": \"In vivo co-IP from cortex, subcellular fractionation, CRISPR/Cas9 KO, rescue with domain deletion constructs, confocal imaging of dendrites\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo binding confirmed, subcellular fractionation, KO phenotype with mechanistic domain rescue, multiple orthogonal methods\",\n      \"pmids\": [\"36604170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Axin1 (but not Axin2) plays an essential role in host defense against Salmonella; pathogenic Salmonella reduces Axin1 levels post-translationally through ubiquitination and SUMOylation involving the DIX domain and Ser614 of Axin1; loss of Axin1 increases bacterial invasiveness and inflammatory response in intestinal epithelial cells.\",\n      \"method\": \"Immunofluorescence, Western blotting, domain mapping (DIX domain and Ser614 mutants), ubiquitination/SUMOylation assays, siRNA knockdown\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with specific mutations, multiple PTM assays, functional readout, single lab\",\n      \"pmids\": [\"22509369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RUNX1 and estrogen receptor (ER) occupy adjacent regulatory elements in AXIN1's second intron; RUNX1 antagonizes estrogen/ER-mediated suppression of AXIN1 transcription; RUNX1 loss in ER+ mammary epithelial cells decreases AXIN1, increases β-catenin, deregulates mitosis, and stimulates proliferation; these effects are rescued by AXIN1 stabilization.\",\n      \"method\": \"ChIP, siRNA knockdown in vitro and conditional KO in vivo, RNA-seq, rescue experiments with AXIN1 stabilization\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP identifying binding sites, in vivo KO, in vitro rescue, RNA-seq, multiple orthogonal methods\",\n      \"pmids\": [\"26916619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Vitamin D receptor (VDR) transcriptionally regulates Axin1 expression via a genomic VDR binding site in the Axin1 regulatory region; VDR deletion reduces cytosolic Axin1 protein and mRNA; VDR and Axin1 do not physically interact.\",\n      \"method\": \"ChIP assay, conditional intestinal VDR KO mice, Western blot, RT-PCR, subcellular fractionation, cycloheximide/actinomycin chase, immunohistochemistry\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP identifies binding site, in vivo KO confirms, subcellular fractionation, single lab with multiple methods\",\n      \"pmids\": [\"27601169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Axin1 knockdown in satellite cells (skeletal muscle stem cells) suppresses proliferation and promotes premature myogenic differentiation; simultaneous knockdown of Axin1 and β-catenin rescues proliferation and partially prevents premature differentiation, placing Axin1 function upstream of β-catenin in muscle stem cell regulation; Axin1 and Axin2 are not fully redundant in satellite cells.\",\n      \"method\": \"siRNA knockdown, retroviral overexpression, Axin2-null mouse satellite cells, TCF reporter assay, immunofluorescence for nuclear β-catenin\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (double knockdown rescue), reporter assay, null mouse cells, single lab\",\n      \"pmids\": [\"25866367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Axin-1 localizes around the meiotic spindle in mouse oocytes; Axin1 siRNA knockdown causes defective spindles, misaligned chromosomes, failure of first polar body extrusion, impaired pronuclear formation, and loss of γ-tubulin/Nek9 at spindle poles with retention of BubR1 at kinetochores.\",\n      \"method\": \"Immunofluorescence localization, siRNA microinjection into oocytes, spindle assembly checkpoint analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional siRNA knockdown and specific phenotypic readouts, single lab\",\n      \"pmids\": [\"27284927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In tankyrase inhibitor-treated colorectal cancer cells, AXIN1 is not required for degradasome (β-catenin destruction complex assembly) formation, whereas AXIN2 depletion substantially impairs both degradasome formation and its capacity to degrade β-catenin.\",\n      \"method\": \"siRNA depletion, tankyrase inhibitor (G007-LK) treatment, fluorescence microscopy of degradasomes, β-catenin degradation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean siRNA depletion of AXIN1 vs AXIN2 with functional readout, single lab, orthogonal imaging and biochemical methods\",\n      \"pmids\": [\"28107521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Peptide microarray mapping of the AXIN1 intrinsically disordered region identified multiple binding epitopes for CK1ε, c-Myc, Pin1, and p53; AXIN1 competes with Dishevelled (DVL) for CK1ε binding and regulates CK1ε-induced DVL phosphorylation and Wnt/β-catenin activation, validated with epitope-mimicking peptides and short deletion variants.\",\n      \"method\": \"Peptide microarray, in vitro binding assay, epitope-mimicking peptide competition, AXIN1 deletion variants, phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro peptide microarray with functional validation using competitive peptides and deletion mutants, single lab\",\n      \"pmids\": [\"30166345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"C9orf140, identified by tandem-affinity purification and mass spectrometry as an Axin1-interacting protein, negatively regulates Wnt/β-catenin signaling by outcompeting PP2A for Axin1 binding, thereby shifting the balance toward β-catenin phosphorylation and preventing Wnt3A-induced β-catenin accumulation; Wnt-induced C9orf140 expression via β-catenin creates a negative feedback loop.\",\n      \"method\": \"TAP-MS, Co-immunoprecipitation, competitive binding assay, zebrafish validation, reporter assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TAP-MS discovery, reciprocal Co-IP, competitive binding, in vivo zebrafish validation, single lab\",\n      \"pmids\": [\"29531269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AXIN1 deletion cooperates with c-Met activation to induce hepatocellular carcinoma in mice in a β-catenin-dependent but Notch-independent manner; genetic deletion of β-catenin completely prevented HCC development in c-Met/sgAxin1 mice, whereas blocking Notch via dominant-negative RBP-J or Notch2 ablation had no effect.\",\n      \"method\": \"CRISPR/Cas9 gene deletion in vivo, hydrodynamic transposition, conditional Ctnnb1 KO, dominant-negative RBP-J, Notch2 KO, gene expression analysis\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo epistasis with genetic KO of downstream effectors, multiple genetic perturbations, rigorous controls\",\n      \"pmids\": [\"30737831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AXIN1 binds to YAP/TAZ in human HCC cells and regulates YAP/TAZ stability; deletion of Axin1 strongly induces nuclear YAP/TAZ; concomitant Yap and Taz deletion significantly inhibits c-Met/sgAxin1-driven HCC, identifying YAP/TAZ as major downstream effectors of AXIN1 loss-driven hepatocarcinogenesis.\",\n      \"method\": \"Co-immunoprecipitation, conditional YAP/TAZ KO in vivo, inducible CreERT2 system, tumor growth assays, tankyrase inhibitor combination treatment\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding by Co-IP plus in vivo epistasis with conditional KO, single lab\",\n      \"pmids\": [\"35921500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SIRT4 translocates from mitochondria to the cytoplasm upon Wnt stimulation and deacetylates Axin1 at K147 (within the RGS domain); K147 acetylation in resting cells maintains the destruction complex; the Axin1-K147R mutant impairs β-TrCP assembly into the destruction complex, leading to β-catenin accumulation even without Wnt stimulation.\",\n      \"method\": \"Acetylation assay, SIRT4 overexpression and KD, site-directed mutagenesis (K147R), subcellular fractionation, Co-IP\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis with functional readout and deacetylase identification, single lab\",\n      \"pmids\": [\"35707358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Hypoxia induces lactylation of Axin1 protein at K147, which promotes its ubiquitination and proteasomal degradation, thereby relieving Axin1-mediated suppression of glycolysis and cell stemness in esophageal carcinoma cells; Axin1-K147 mutant resistant to lactylation reverses these effects.\",\n      \"method\": \"Pan-lysine lactylation mass spectrometry, site-directed mutagenesis (K147), ubiquitination assay, ECAR/glucose/lactate measurements, in vivo tumor growth\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis, PTM assay, functional metabolic readout, in vivo validation, single lab\",\n      \"pmids\": [\"38972426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AXIN1 stabilizes the antiviral transcription factor IRF3 by recruiting USP35, which removes K48-linked ubiquitination at IRF3 K366, preventing p62-mediated autophagic degradation; upon virus infection, TBK1-phosphorylated AXIN1 undergoes phase separation, increasing IRF3 phosphorylation and IFN-I production; KYA1797K (binding AXIN1 RGS domain) enhances AXIN1-IRF3 interaction.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay (K48-linkage specific), autophagic flux assay, phase separation imaging, TBK1 phosphorylation assay, pharmacological RGS-domain ligand\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal biochemical methods (Co-IP, ubiquitination linkage specificity, phase separation, phosphorylation), mechanistic mutagenesis, pharmacological validation, single lab\",\n      \"pmids\": [\"39384753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Analysis of 80 tumor-associated AXIN1 missense variants identified 18 that significantly activate β-catenin signaling; most loss-of-function missense mutations lose binding to the interaction partner corresponding to the mutated domain (GSK3β, β-catenin, or RGS/APC binding domains); truncated AXIN1 proteins inversely correlate with β-catenin regulatory function.\",\n      \"method\": \"Co-immunoprecipitation for each domain-specific binding partner, β-catenin reporter assay, structural prediction analysis for 80 variants\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — systematic functional analysis of 80 variants with Co-IP and reporter assay, structural validation, comprehensive domain mapping\",\n      \"pmids\": [\"38359148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AXIN1 forms a complex with AMPK and LKB1 in skeletal muscle during contraction; contraction and AMPK activation upregulate total Axin1 protein; Axin1 knockdown reduces AMPK activation, GTP-loading of Rac1, PAK phosphorylation, and contraction-stimulated glucose uptake in C2C12 myotubes, defining an AMPK/Axin1-Rac1 signaling axis.\",\n      \"method\": \"Reciprocal co-immunoprecipitation from myotubes and mouse muscle, siRNA knockdown, AMPK activator treatment, glucose uptake assay, GTP-Rac1 pull-down\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP in vitro and in vivo, functional knockdown with specific pathway readouts, single lab\",\n      \"pmids\": [\"31846370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In skeletal muscle-specific AXIN1 knockout mice, AXIN1 deletion does not affect AMPK/mTORC1 signaling or glucose uptake at rest or during contraction/exercise under most conditions, with the only difference being elevated α2/β2/γ3 AMPK activity and AMP/ATP ratio in gastrocnemius during exercise (likely due to AXIN2 functional redundancy).\",\n      \"method\": \"Tamoxifen-inducible muscle-specific KO, AMPK/mTORC1 phosphorylation assays, glucose uptake assay, exercise protocols, AMP/ATP measurement\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with comprehensive phenotypic characterization; negative result is itself mechanistically informative (redundancy with AXIN2)\",\n      \"pmids\": [\"33913171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"UCHL5 deubiquitinase physically interacts with multiple domains of Axin1 and is required for both stabilization and polymerization of Axin1 proteins; these events are governed by deubiquitination in the DIX domain of Axin1 but do not require the catalytic deubiquitinating activity of UCHL5.\",\n      \"method\": \"Co-immunoprecipitation, Axin1 domain-binding assays, Axin1 polymerization assay, catalytic UCHL5 mutant analysis, β-catenin reporter assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-binding Co-IP, polymerization assay, catalytic mutant analysis, single lab\",\n      \"pmids\": [\"35256667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Axin1 is required for IFN-γ/Th1-mediated intestinal immune program; intestinal epithelial Axin1 deficiency renders mice more susceptible to chemically induced colon carcinogenesis but reduces DSS-induced colitis; Axin1 has redundant function with Axin2 for Wnt pathway down-regulation in the intestine.\",\n      \"method\": \"Intestinal epithelial-specific Axin1 KO, Axin2 KO, chemically induced tumorigenesis, DSS colitis, RNA-seq\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo conditional KO with multiple disease models and transcriptomic analysis, single lab\",\n      \"pmids\": [\"36356835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Axin-1 C-terminal region (710-797 aa) binds the N-terminal region (1-100 aa) of Caveolin-1; disruption of this interaction by CRISPR/Cas9 increases TNF-α and IL-6 production and reduces β-catenin in alveolar type I cells challenged with LPS; Axin-1 functions as an adaptor for Caveolin-1 in regulating inflammatory cytokine production.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation with domain mapping, CRISPR/Cas9 disruption, cytokine ELISA\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus Co-IP with domain mapping plus CRISPR functional disruption, single lab\",\n      \"pmids\": [\"30954225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"YTHDF2 RNA m6A reader promotes AXIN1 mRNA decay, thereby activating Wnt/β-catenin signaling in lung adenocarcinoma; knockout of AXIN1 rescues the inhibitory effect of YTHDF2 depletion on lung cancer cell proliferation, colony-formation, and migration.\",\n      \"method\": \"RNA-seq, m6A-seq, CLIP-seq, RIP-seq, mRNA stability assay, AXIN1 KO rescue experiment\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — integrative multi-omics plus epistatic rescue experiment, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"33980824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Deletion of Axin1 in condylar chondrocytes at adult stage causes OA-like degeneration associated with activation of both β-catenin and FGF/ERK1/2 signaling; increased Fgfr1 expression, MMP13 and Adamts5, and decreased lubricin were detected; both pathways cooperatively contribute to cartilage degeneration.\",\n      \"method\": \"Conditional tamoxifen-inducible chondrocyte KO, immunostaining, qRT-PCR, histomorphometry\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO in vivo with multiple pathway readouts, single lab\",\n      \"pmids\": [\"30070692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Specific deletion of Axin1 in limb mesenchymal cells activates both β-catenin and BMP signaling, leading to fibular hemimelia-like phenotype; inhibition of either β-catenin or BMP signaling significantly reverses the FH phenotype, demonstrating that Axin1 controls limb development through integration of both pathways.\",\n      \"method\": \"Conditional limb mesenchyme Axin1 KO, pharmacological β-catenin and BMP inhibition, in vivo rescue\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean in vivo conditional KO with pharmacological epistasis experiments showing both pathways required, multiple rescue experiments\",\n      \"pmids\": [\"36541713\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AXIN1 is a multifunctional scaffold protein that serves as the concentration-limiting component of the β-catenin destruction complex (together with APC, GSK3β, and CK1), where its natively disordered central region coordinates β-catenin phosphorylation, ubiquitination, and proteasomal degradation within an intact complex; upon Wnt signaling, β-catenin ubiquitination within the complex is suppressed without complex disassembly, leading to complex saturation and accumulation of free, transcriptionally active β-catenin. Beyond Wnt, AXIN1 scaffolds a c-Myc degradation complex (with GSK3β, Pin1, and PP2A-B56α), forms a regulatory complex with NRF2 to control antioxidant metabolism, interacts with YAP/TAZ to regulate Hippo signaling, stabilizes IRF3 against autophagic degradation and undergoes phase separation to boost antiviral IFN-I production, and is subject to multiple post-translational modifications including ubiquitination by E3 ligases (TRIM65, TRIM11, RNF146, UBE3C, TRIM54, TRIM32, TRIM46), deubiquitination by USP44 and UCHL5, deacetylation of K147 by SIRT4, and lactylation at K147 under hypoxia, all converging on control of AXIN1 protein stability and thus Wnt pathway activity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AXIN1 is a multifunctional scaffold that acts as a negative regulator of Wnt/β-catenin signaling, with restoration of wild-type AXIN1 inducing apoptosis in cancer cells bearing APC, CTNNB1, or AXIN1 mutations and suppressing TCF/β-catenin transcription [#0, #1]. Its central region is intrinsically disordered, enabling the dynamic kinase–substrate contacts that bring GSK3β and β-catenin together for phosphorylation [#3], and peptide-level mapping defines discrete binding epitopes within this region for partners including CK1ε, c-Myc, Pin1, and p53 [#22]. Within an intact AXIN1-organized destruction complex, β-catenin is phosphorylated, ubiquitinated, and degraded; Wnt signaling does not disassemble this complex but suppresses β-catenin ubiquitination, saturating the complex with phospho-β-catenin so that newly synthesized free β-catenin accumulates [#4]. Systematic analysis of tumor-associated missense variants shows that loss-of-function mutations selectively abolish binding to the partner corresponding to the mutated domain (GSK3β, β-catenin, or RGS/APC), and that truncated AXIN1 loses β-catenin regulatory function [#29]. Beyond β-catenin, AXIN1 scaffolds a c-Myc degradation complex with GSK3β, Pin1, and PP2A-B56α, controlling the T58/S62 phosphorylation balance that governs c-Myc stability [#2, #6], and it physically engages NRF2 to restrain an antioxidant gene program [#7] and YAP/TAZ to limit their nuclear accumulation [#25]. In vivo, hepatocyte- or mesenchyme-specific Axin1 loss drives proliferation and tumorigenesis through β-catenin and cooperating YAP/TAZ, FGF/ERK, or BMP signaling [#5, #24, #25, #37], establishing AXIN1 as a tumor suppressor whose dosage is tightly controlled by E3 ligases (TRIM65, TRIM11) and deubiquitinases (USP44, UCHL5) acting on its stability and polymerization [#8, #9, #32], by transcriptional inputs from RUNX1 and VDR [#17, #18], and by m6A-directed mRNA decay via YTHDF2 [#35]. AXIN1 also operates outside growth control: it stabilizes the antiviral factor IRF3 via USP35-mediated deubiquitination and undergoes TBK1-driven phase separation to boost type I interferon production [#28], scaffolds AMPK/LKB1 signaling in contracting muscle [#30], and links γ-protocadherin-C3 to dendritic arborization in cortical neurons [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established AXIN1 as a tumor-suppressing negative regulator of Wnt signaling whose restoration kills cancer cells with destruction-complex mutations.\",\n      \"evidence\": \"Adenoviral AXIN1 transfer and TCF DNA-binding assays in hepatocellular and colorectal cancer lines\",\n      \"pmids\": [\"10700176\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the molecular architecture of the complex\", \"Mechanism of apoptosis induction not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Localized AXIN1's Wnt-suppressing function to its GSK3-binding domain and confirmed the role in vivo through a developmental patterning phenotype.\",\n      \"evidence\": \"Zebrafish masterblind allele mapping, GSK3/Axin1 binding assay, and rescue by overexpression\",\n      \"pmids\": [\"11390362\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address mammalian destruction-complex stoichiometry\", \"Other domain functions untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended AXIN1 scaffolding beyond β-catenin to c-Myc, showing it assembles a c-Myc degradation complex controlling T58/S62 phosphorylation.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA knockdown, and phosphorylation assays with GSK3β, Pin1, PP2A-B56α\",\n      \"pmids\": [\"19131971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-lab finding\", \"Quantitative contribution to c-Myc turnover in vivo unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided the biophysical basis for AXIN1 scaffolding by showing its central region is intrinsically disordered, enabling dynamic kinase-substrate engagement.\",\n      \"evidence\": \"NMR, circular dichroism, and analytical ultracentrifugation of the central region\",\n      \"pmids\": [\"21087614\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the assembled complex not resolved\", \"Disorder-to-binding transitions not mapped at residue level\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Redefined the Wnt mechanism by showing the destruction complex stays intact and that Wnt suppresses β-catenin ubiquitination, leading to complex saturation rather than disassembly.\",\n      \"evidence\": \"Endogenous IP-MS, proteasome inhibition, and Wnt stimulation in colorectal cells and primary intestinal epithelium\",\n      \"pmids\": [\"22682247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular trigger of ubiquitination suppression not fully defined\", \"Role of AXIN1 vs AXIN2 not distinguished here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected AXIN1 to redox homeostasis by demonstrating a physical complex with NRF2 that restrains the antioxidant program.\",\n      \"evidence\": \"Reciprocal Co-IP with domain mapping, tankyrase inhibitors, and conditional liver KO mice\",\n      \"pmids\": [\"25336178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NRF2 regulation is destruction-complex dependent unclear\", \"Direct fate of NRF2 within the complex not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mapped discrete binding epitopes across the AXIN1 disordered region and showed competition with Dishevelled for CK1ε.\",\n      \"evidence\": \"Peptide microarray, in vitro binding, and competitive peptide/deletion variant assays\",\n      \"pmids\": [\"30166345\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro mapping not all validated in cells\", \"Functional hierarchy among epitopes unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Systematically defined how tumor mutations inactivate AXIN1 by abolishing domain-specific partner binding, linking genotype to β-catenin activation.\",\n      \"evidence\": \"Co-IP for each domain partner and β-catenin reporter assays across 80 missense variants\",\n      \"pmids\": [\"38359148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Variant effects on non-Wnt functions not tested\", \"In vivo pathogenicity of individual variants not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed an AXIN1 role in innate antiviral immunity through IRF3 stabilization and TBK1-driven phase separation.\",\n      \"evidence\": \"Co-IP, K48-linkage-specific ubiquitination, autophagic flux, phase separation imaging, and RGS-ligand pharmacology\",\n      \"pmids\": [\"39384753\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance to host antiviral defense in vivo limited\", \"Interplay with Wnt scaffolding function unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated AXIN1 stability is governed by deubiquitinases controlling both protein level and polymerization independently of catalytic activity.\",\n      \"evidence\": \"Domain-binding Co-IP, polymerization assays, and catalytic UCHL5 mutant analysis\",\n      \"pmids\": [\"35256667\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Non-catalytic mechanism mechanistically undefined\", \"USP44/UCHL5 redundancy not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AXIN1's many roles (Wnt, c-Myc, NRF2, YAP/TAZ, IRF3, AMPK, neuronal arborization) are partitioned in a single cell and integrated with AXIN2 redundancy remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating distinct AXIN1 complexes\", \"Quantitative AXIN1 vs AXIN2 functional division incompletely mapped\", \"Whether phase separation governs scaffolding broadly is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 4, 28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 4, 7, 25]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 7, 18]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14, 34]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 4, 25]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 4, 8, 32]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 24, 29]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [28, 33]}\n    ],\n    \"complexes\": [\"β-catenin destruction complex\", \"c-Myc degradation complex\"],\n    \"partners\": [\"GSK3B\", \"CTNNB1\", \"NFE2L2\", \"YAP1\", \"IRF3\", \"PIN1\", \"PPP2R5A\", \"PRKAA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}